Which of the following processes represents a neutralisation reaction ?

Wasp sting contains alkali which is neutralized by vinegar. Toothpaste is alkaline in nature and neutralized the acid produced by fermentation of food particles by bacteria present in our mouth sodium hydroxide (base) neutralsises hydrochloric acid (acid) to form sodium chloride (salt) and water $\left({\mathrm{H}}_2\mathrm{O}\right)$.